Snatch-block.



W. TREWHELLA. SNATGH BLOCK.

APPLICATION FILED JAN.16, 1911.

1,022,569, a I Patented Aprig, 1912.

a subject of the King of siding at Trent-ham, in the WILLIAM TREW'HELLA,0E TEENTHAM, VICTORIA, AUSTRALIA.

SNATCH-BLOCK.

To all whom it my concern: 7

Be it known that 1, WILLIAM. TREWHELLA,

Great Britain, re-

State of Victoria, Commonwealth of Australia, have invented Improvementsin Snatch-Blocks, of which the following is a specification.

This invention relates to that class of snatch-block in which the sideplates or cheeks are fixed rigidly to the sheave spindle and provisionis made for the insertion or removal of the rope by means of ahingedcross bar at the outer end of cheeks. It has been usual to attach thecross bar by a hinged joint to one cheek in such a manner that it willopen outwardly and to secure it to the other cheek when closed by meansof a removable pin or bolt.

The objects of my improvements are to do away with the necessity for aremovable pin or bolt, to obtain greater strength by transferring thestrain direct from thecross bar to the cheeks and to reduce the cost ofmanufacture by enabling the cheeks to be stamped from sheet metalinstead of being cast or forged as heretofore.

The invention is illustrated by the accompanying drawings, whereof;

Figure 1 is a side elevationof the improved snatch-block with the crossbar open. Fig. 2 an end elevation thereof partly in section with thecross bar closed, while Fig. 3 is part end elevation showing the crossbar released. Fig. i is a vertical section through the upper part of thesnatch-block showing the removable cross bar.

, According to this invention the side plates or cheeks 1, 2, of thesnatch-block are each formed with an elongated hole or closed slot 3, 4,and thecross bar 5 is provided with two shoulders (z and b so that whenthe baris drawn outwardly into'its'operalive position said shouldersbear against the ends 6, 7, of said slots 3, 4, and the strainistransferred direct from said cross bar to the cheeks without theinterposition of any pin or bolt. The cross bar may be re1novable as inFig. 4, but it is preferably attached to the snatch-block in such amanner that it may be readily drawn into its operative position. As anexample one end of Specification! Letters Eatent. Application filedJanuary 16, 1911. Serial No. 602,928.

-bar to swing Patented Apr. a, rare.

the cross bar may be formed with a small hole 8 and a. pivot 9 is passedloosely through same and two small lugs 10,10, formed on the outside ofone cheek 1, as shown in Figs. ngand 3. The slots in the cheeks arelongenough'to allow the cross inwardly into the open position, as inFig. Means are provided to prevent displacement of the cross bar whichmay be formed with a central raised portion 11 between the shoulders a,b, and which fits-between the cheeks and maintains the cross bar inposition while with the same object in view said-bar may haveeither oneor two upturned lugs 12, 12, about its ends,-

which engage the outside of the cheeks adjacent the ends of the slotstherein, and cooperate with the raised portion to .hold the cheeks rigidrelatively to each other; i

The pivot lugs 10, 10, are preferably formed by stamping them integralwith the cheek and then bending them to a right angle therewith.

The cheeks are each formed on their edges with pairs of horns 13, 13,the projecting ends of which extend laterally and over the flanges of asheave'lfi to guide the rope in the groove of the she-ave 16, and saidcheeks are fitted upon sided portions 14, 1%, of the sheave spindle 15so as to be, rigidly fixed thereto.

Having now particularly described and ascertained the nature of my. saidinvention and in What manner the same is to be performed, I declare thatwhat I claim is A new article of manufacture, a sheet metal snatchblock, comprising a pulley, an axle therefor, a stamped, piece fixed onthe pulley axle on each side of the pulley and formed with guide hornshaving their ends extending over the flanges of the pulley, said cheekpieces having longitudinal slots closed at their ends, one of said cheekpieces having integral lugs bent at right-angles thereto on each side ofthe s.ot,,a pin mounted in the lugs extending across the slot, astamped, sheet-metal cross piece of substantially the same width as theslot pivoted on said pin between the lugs and having straight shouldersnear its ends to bear against said closed ends of th: slots,

sheet-metal check said bar being formed with a central raised portionextending from one cheek to the other, forming interior abutments forsaid cheeks and with an upturned lug on the free end to engage theoutside of the other cheek piece, whereby said pieces are lockedtogether.

1J1 testimony whereof I have hereunto se my hand 1n presence of twosubscribing wit nesses.

WILLIAM TREWHELLA. 'VVitnesses: I EDWARD WATERS,

W ILLIAM HERBERT \VATERs.

